The entire John H. Seinfeld Festschrift can be found here:
pubs.acs.org/page/aeacd5/...

New research group photo! Taken as if we are a rather large indy band.

Flats East of Sprucedale
Mendelson Joe
2003

Atmospheric Chemistry Insights from the Global COVID-19 Pandemic: A Review The COVID-19 pandemic and resulting reductions in worldwide emissions, associated primarily with the transport sector, provided an unprecedented opportunity to explore the response of atmospheric chemistry and composition to large anthropogenic emissions perturbations. While air quality generally improved in early 2020, this was tempered by increased formation of secondary pollutants (e.g., O3 and secondary particulate matter, PM) in many regions studied. Declines in NOx emissions were largely responsible for the changes in O3, driving decreases in O3 concentrations in remote regions and increases in urban regions due to both decreases in O3 titration by NOx and also nonlinear changes in O3 production. Lower NOx levels also increased the levels of other oxidants (e.g., OH and O3), leading to a general increase in atmospheric oxidation in polluted urban regions. This enhanced oxidation promoted additional PM formation in some regions but was generally outweighed by decreases in primary PM and other secondary precursors (SO2 and VOCs). The COVID-19 pandemic gave rise to large local perturbations in air quality but only modest reductions in the global abundance of short-lived climate forcers (including O3 and PM).

Delighted to share that our review on what the COVID-19 lockdowns revealed about atmospheric chemistry was published today. What fun to write papers with wonderful colleague/friends! @jessekroll.bsky.social @envchemjen.bsky.social @chemdelphine.bsky.social

pubs.acs.org/doi/10.1021/...

Group Leader in Observational Atmospheric Chemistry

We are looking for a Group Leader in Observational Atmospheric Chemistry. If you are a mid-career person interested in moving to lovely Zurich, please take a look and get in touch! jobs.ethz.ch/job/view/JOP...

PostdocAd-GXS Postdoctoral Associate: Geostationary measurements of atmospheric chemistry Join us! Our atmospheric chemistry group at the University of Minnesota (UMN) is seeking applications for a Postdoctoral A...

Postdoc opening: Geostationary measurements of atmospheric chemistry

Join us! Our group seeks a postdoc to work on space-based measurements of atmospheric chemistry with the new generation of geo-IR satellite instruments.

See z.umn.edu/b5iz for details & contact me (dbm@umn.edu) with questions!

Atmospheric Chemistry within the Earth System: Understanding Changes and Impacts
7-11 September 2026
@igacproject.org
ABSTRACTS DUE 27 FEBRUARY 2026
Abstracts: icacgp-igac2026.org/abstract-sub...
Registration: icacgp-igac2026.org/registration/
Star studded Keynote and invited speakers list!

Trump repeals U.S. government’s power to regulate climate The Environmental Protection Agency finishes the repeal of the “endangerment finding,” a landmark legal opinion underpinning policies regulating climate change.

Trump trying to make RCP8.5 happen.

National Academies Publish New Report Reviewing Evidence for Greenhouse Gas Emissions and U.S. Climate, Health, and Welfare A new National Academies report reviews evidence gathered by the scientific community since 2009 on greenhouse gas emissions and their effects on U.S. climate, health, and welfare.

The @nasonline.org report provides a comprehensive overview of the science evidence linking greenhouse gas emissions to climate change impacts on human health and welfare www.nationalacademies.org/news/nationa...

Xhuwaji – Haida Grizzly Bear
Bill Reid
1990

Goodhart’s Law: Are Academic Metrics Being Gamed? Publishing a paper in academia is challenging, stimulating, and a bit baffling. Challenging because the research might fail. Stimulating because research may start assuming one outcome and finish with...

I just learned about Goodhart's Law "When a measure becomes a target, it ceases to be a good measure". So relevant to negative trends in academic publishing as discussed here: thegradient.pub/over-optimiz...

Two new faculty openings at U. Minnesota 🧪

Assist. Prof. in Climate Science
hr.myu.umn.edu/jobs/ext/372...
Questions: Tim Griffis, tgriffis@umn.edu

Assist. Prof. in Soil Physics / Ecohydrology / Hydropedology
hr.myu.umn.edu/jobs/ext/372...
Questions: David Mulla, mulla003@umn.edu

Due March 13

The Feeling You Haven't Had in a Long Time
Steve Driscoll
2021

Mark Carney's full speech at the World Economic Forum YouTube video by National Post

Tbf, this is probably the actual best thing in 2026 so far… youtu.be/btqHDhO4h10?...

Macron apparently has an eye condition that requires him to look cool as hell.

bsky.app/profile/mark...

The worst climate and weather news you’ll see today.

E.P.A. to Stop Considering Lives Saved When Setting Rules on Air Pollution

Whaaat?! The EPA's cost-benefit analysis of air pollution regulations can only consider costs to businesses but not health benefits?! This is nonsense.

GIFT ARTICLE: www.nytimes.com/2026/01/12/c...

Winter Schoolhouse
Maud Lewis
c. 1958

After reviewing nearly 200 applications from prospective grad students and postdocs over the past few months for a couple different 🧪⚒️ postings, here are some tips, at least as they apply to North American positions. I hope they help future applicants. Share with your networks. 🧵

Home for Christmas
Maud Lewis
c. 1958

NCAR and UCAR have released a statement. NSF has not provided any guidance to UCAR or NCAR leadership about this whole situation. news.ucar.edu/133054/ucar-...

As someone who both loves the New Yorker and is learning German this does my head in. 🚫 to diaeresis

Americans don't understand the big deal about electric kettles because we're on 120 VAC. Once we see how fast water boils at 230 VAC, there's no going back.

Investigating fire-induced ozone production from local to global scales Abstract. Tropospheric ozone (O3) production from wildfires is highly uncertain; previous studies have identified both production and loss of O3 in fire-influenced air masses. To capture the total ozo...

My last MIT student, Joe, explored what controls the ozone formed in fire plumes. His paper is out today in ACP. Happy Thanksgiving! acp.copernicus.org/articles/25/...

PhD Opportunity on Volatiles from Plants & Climate Change 🌍🧪
Join @fz-juelich.de to explore how future climate scenarios impact plant emissions and atmospheric chemistry using mass spectrometry measurements. Learn more: www.hitec-graduate-school.de/call2025/ --> Project 4! #PhDOpportunity

Another terrifying article about Stardust, with (what I think is) some new info:
- they claim they'll finally release info on their secret particles starting in early 2026
- they plan a first atmospheric test in 2027
- they've been funding academic research (with one PI named)

Haida Raven
Bill Reid ~ Haida
1972

If you work on sources and impacts of VOCs (biogenic or anthropogenic) from measurement to modeling perspectives please submit an abstract to our atmospheric organics session at #EGU26! Our invited speakers are @dbm.bsky.social and @jacquirickard.bsky.social See you in Vienna! tinyurl.com/55vda8u7

Thanks to Chuck Schumer, the assembly line at the Lucy/Charlie Brown football meme factory has broken down. Folks are advised to look for other metaphors until service can be restored.

The ‘pavement vigilante’: why Cameron Roh is naming and shaming bad walking etiquette He films people breaking his self-created ‘laws’ of street decorum and posts the videos online – with many viewers expressing their gratitude. So watch out if you’re rushing along on your phone or whe...

I approve of pavement vigilantism! It’s chaos out there! www.theguardian.com/lifeandstyle...